OSCM Ch 8, 9,and 10

in very short paragraph answer these qustions.

Ch 8Q What is difference between Six Sigma quality and TQM approaches?

Ch9  Why is it critical to have a smaller supply base before committing to a supplier management and development programs?

Ch10 Q What is Letter of Credit? What are its uses and advantages? (Watch the video posted on "Course Materials" sections before attempting this 100 worlds Max for each qustion

Also I need this for 2 diffrent students  that means 2 answer for each qustion